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작동 연료온도가 Bypass type 피에조 인젝터의 분사 특성에 미치는 영향
조인수,이진욱,Cho, Insu,Lee, Jinwook 한국분무공학회 2019 한국액체미립화학회지 Vol.24 No.2
Diesel vehicles suffer from poor starting and running problems at cold temperatures. Diesel vehicles have the characteristic that CO and PM are reduced or similarly discharged when going from low temperature to high temperature. In this study, a bypass type piezo injector for electronic control based common rail injection system was used. Numerical analysis using injector drive analysis model was performed to analyze injector drive and internal fuel flow characteristics according to fuel temperature change. The results show that the rate of density change due to the fuel temperature is proportional, and that the effect of the kinematic viscosity is relatively large between $-20^{\circ}C$ and $0^{\circ}C$. Comparing the results of temperature condition at $0^{\circ}C$ and $20^{\circ}C$, it is considered that the viscosity is more correlated with the needle displacement than the pressure chamber of the delivery chamber.
UDS 보안 테스팅을 위한 세션 및 서비스 스캐너 구현
조인수(Insu Cho),윤진영(Jin-yeong Yoon),엄성욱(Sung-wook Eom) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
UDS is an international standard protocol for integrated diagnostic services in ECUs and provides powerful functions for vehicle diagnostics. If the security of the UDS diagnosis is compromised and abused, the integrity, confidentiality and availability of the ECU can be seriously affected. This paper aims to implement a scanner to efficiently identify unintended mistakes of developers or custom functions implemented for developer convenience when implementing UDS functions of ECU. The implemented scanner proceeds in the order of session discovery, service discovery, and subfunction discovery. After searching the session information implemented in the ECU using the DFS algorithm, the service and sub function for each session are scanned based on the derived session information. The existence of sessions and services is determined based on the NRC defined in the UDS. As a result of testing the scanner implemented for a specific ECU, 0x05, 0x10 custom sessions and 0x12, 0x20 custom services were found. The scanner presented in this paper scans using only three response cases, but we plan to implement a scanner that provides a wider range of scans through research on specific test methodologies for each service and test methodologies for custom sessions/services in the future.
바이패스 방식 피에조 인젝터의 피에조 적층 및 인가전압에 따른 연료분사 특성 연구
조인수 ( Insu Cho ),김우택 ( Wootaek Kim ),이진욱 ( Jinwook Lee ) 한국액체미립화학회 2020 한국액체미립화학회지 Vol.25 No.1
In the common rail fuel injection system, which is the core of diesel high efficiency and NOX reduction, injection strategies such as high pressure injection of fuel, accurate injection rate control, and multistage injection are important to increase fuel atomization. In this study, the bypass type piezo injector for the electronic control based common rail injection system applied to diesel fuel vehicle was studied. In particular, the injection rate and internal fuel flow characteristics of the high-pressure injector according to the piezo stacking number and applied voltage were analyzed by theoretical numerical method. When the applied voltage changes, it is determined that additional fuel flow through the bypass compensates for the reduced valve driving force due to the change in the driving voltage.
유비쿼터스 서비스 모델 및 분류체계에 관한 연구 : GIS(Geographic Information System) 산업을 중심으로
조인수(Cho, Insu),박희준(Park, Heejun),원종태(Won, Jong-Tae) 한국IT서비스학회 2009 한국IT서비스학회 학술대회 논문집 Vol.2009 No.1
본 연구는 유비쿼터스 환경에서의 체계적 서비스를 도출하기 위한 분류체계를 제안하고 이를 유비쿼터스 기반 GIS 서비스에 적용시켜 그 결과를 분석하고 시사점을 도출한다. 이를 위해 기술적 특성과 고객 니즈의 특성을 포함한 유비쿼터스 환경과 서비스 속성을 조사한다. 또한 기존의 제시되었던 u-서비스 분류체계를 분석하고 GIS 산업의 가치사슬과 기술 및 서비스 동향을 조사하여 새로운 유비쿼터스 서비스 분류 체계를 개발하는데 활용한다. 개발된 유비쿼터스 서비스 분류체계를 검증하기 위해 유비쿼터스 기반 GIS 서비스의 도입 사례를 조사하여 적용해본다. 적용 결과를 통해 분류 체계의 적합성을 검증하고 향후 GIS 서비스 도입 시 고려해야 할 사항과 발전방안을 제시한다.
압축착화기관용 가변밸브 듀레이션(VVD)시스템의 제어전략에 따른 유동 및 연소성능 해석
조인수 ( Insu Cho ),김우택 ( Wootaek Kim ),이진욱 ( Jinwook Lee ) 한국분무공학회지 2020 한국액체미립화학회지 Vol.25 No.2
Recently, global warming and environmental pollution are becoming more important, and fuel economy is becoming important. Each automobile company is actively developing various new technologies to increase fuel efficiency. CVVD(Continuously Variable Valve Duration) system means a device that continuously changes the rotational speed of the camshaft to change the valve duration according to the state of the engine. In this paper, VVT(Variable Valve Timing) and CVVD were applied to a single-cylinder diesel engine, and the characteristics of intake and exhaust flow rate and in-cylinder pressure characteristics were analyzed by numerical analysis. In order to analyze the effect of CVVD on the actual engine operation, the study was performed by setting the valve control and injection pressure as variables in two sections of the engine operating region. As a result, In the case of applying CVVD, the positive overlap with the exhaust valve is maintained, thus it is possible to secure the flow smoothness of air and increase the volumetric efficiency by improving the flow rate. The section 2 condition showed the highest peak pressure, but the pressure rise rate was similar to that of the VVT 20 and CVCD 20 conditions up to 40 bar due to the occurrence of ignition delay.
지식활동성과 향상을 위한 지식공유의 영향요인에 대한 연구
조인수(Insu Cho),박희준(Heejun Park) 한국전자거래학회 2008 한국전자거래학회 심포지움 및 기타간행물 Vol.- No.-
본 연구는 관계중심적 지식관의 관점에서 지식공유의 영향 요인을 파악하고, 이 요인들이 실제로 지식공유에 긍정적인 영향을 미쳐서 지식성과활동을 향상 시키는지 알아보고자 한다. 독립변수인 관계적 요인은 신뢰, 개방적 의사소통, 협동으로 설정하였고, 지식공유의 영향을 받는 종속 변수인 지식활동성과는 지식품질과 지식경영사용자만족도로 설정하였다. 본 연구를 통해 조직경쟁력 향상을 위해서는 지식뿐만 아니라 그것을 사용하는 사람 및 주변 환경까지 관리할 필요가 있음을 제안한다. This study finds out the influence factor of knowledge sharing based on the viewpoint of the relationship central knowledge and inquires out the relationship between knowledge sharing and a knowledge activity performance. The related factor is set trust, openness communication and cooperation as independent variables. And the knowledge activity performance is set knowledge quality and user knowledge satisfaction as dependent variables which are influenced by knowledge sharing. This study proposes that to improve the organizational performance needs to manage not only knowledge, but also the users and surroundings.